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Thread: Ut oh, vacuumed pool in backwash mode.

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    Ut oh, vacuumed pool in backwash mode.

    Hello all. I'm not really new to pools, but new to my new sand filter(previously had a cartridge filter). I was trying to vacuum my pool to waste and for some in reason in my mind I thought I was, but I set the valve on backwash. So I vacuumed a bunch of dead algae and dirt on backwash. I was told this was a big NO NO by my pool guy who installed it. What can I expect in the future after doing this?

    thanks in advance.

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    Mod Squad JohnT's Avatar
    Join Date
    Apr 2007
    SW Indiana

    Re: Ut oh, vacuumed pool in backwash mode.

    Welcome to TFP.

    First, you should rinse the filter before returning to filter mode.

    What happens may depend on the nature of the debris. If it was dead algae or other fine stuff, it will probably rinse out with no problem. If it was larger stuff, you could potentially have some partially clogged laterals or even some debris stuck in the sand outside the laterals. The latter situation could give you a little more operating pressure on your filter, but realistically I doubt you'll experience any long-term issues.
    TFP Moderator
    20K Gallon 20X36 Vinyl Inground
    Hayward S244T Sand Filter with 1HP Whisperflo Pump. Liquidator C-201 and Solar Heat

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    Re: Ut oh, vacuumed pool in backwash mode.

    A sand filter works by passing your pool water through a layer of sand and is returned to the pool after the sand filters out the debris. When you backwash you reverse the direction of water flow and this rinses out the sand. By vacuming on backwash you deposited debris from the pool on the " clean side" of the sand. Depending on what you were vacuming ( normal stuff or algea and debris from winter) it could range from redepositing the stuff in your pool to plugging up your filter.
    Turn your filter back to filtering the pool note the pressure on the filter. Is this number about the same as normal? If its 10 lbs higher than normal you could attempt to back wash it. If its higher a better coarse of action would be to replace the sand and start over. Chances are you have not damaged anything at all , and at worst you will have to vacume again in a day or 2.
    20k gal. IG fiberglass/plaster rectangle 32'x16'
    Hayward Superpump 3/4 H.P. primary Hayward model 5060 Booster Pump
    Hayward Pro Series High Rate Sand Filter
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